Пример #1
0
static int ftpc_sendfile(struct ftpc_session_s *session, const char *path,
                         FILE *stream, uint8_t how, uint8_t xfrmode)
{
  long offset = session->offset;
#ifdef CONFIG_DEBUG
  FAR char *rname;
  FAR char *str;
  int len;
#endif
  int ret;

  session->offset = 0;

  /* Were we asked to store a file uniquely?  Does the host support the STOU
   * command?
   */

  if (how == FTPC_PUT_UNIQUE && !FTPC_HAS_STOU(session))
    {
      /* We cannot store a file uniquely */

      return ERROR;
    }

  ftpc_xfrreset(session);
  FTPC_SET_PUT(session);

  /* Initialize for the transfer */

  ret = ftpc_xfrinit(session);
  if (ret != OK)
    {
      return ERROR;
    }

  ftpc_xfrmode(session, xfrmode);

  /* The REST command sets the start position in the file.  Some servers
   * allow REST immediately before STOR for binary files.
   */

  if (offset > 0)
    {
      ret = ftpc_cmd(session, "REST %ld", offset);
      session->size = offset;
    }

  /* Send the file using STOR, STOU, or APPE:
   *
   * - STOR request asks the server to receive the contents of a file from
   *   the data connection already established by the client.
   * - APPE is just like STOR except that, if the file already exists, the
   *   server appends the client's data to the file.
   * - STOU is just like STOR except that it asks the server to create a
   *   file under a new pathname selected by the server. If the server
   *   accepts STOU, it provides the pathname in a human-readable format in
   *   the text of its response.
   */

  switch (how)
    {
    case FTPC_PUT_UNIQUE:
      {
        ret = ftpc_cmd(session, "STOU %s", path);

        /* Check for "502 Command not implemented" */

        if (session->code == 502)
          {
            /* The host does not support the STOU command */

            FTPC_CLR_STOU(session);
            return ERROR;
          }

        /* Get the remote filename from the response */

#ifdef CONFIG_DEBUG
        str = strstr(session->reply, " for ");
        if (str)
          {
            str += 5;
            len = strlen(str);
            if (len)
              {
                if (*str == '\'')
                  {
                    rname = strndup(str+1, len-3);
                  }
                else
                  {
                    rname = strndup(str, len-1);
                    nvdbg("Unique filename is: %s\n",  rname);
                  }
                free(rname);
              }
          }
#endif
      }
      break;

    case FTPC_PUT_APPEND:
      ret = ftpc_cmd(session, "APPE %s", path);
      break;

    case FTPC_PUT_NORMAL:
    default:
      ret = ftpc_cmd(session, "STOR %s", path);
      break;
  }

  /* If the server is willing to create a new file under that name, or
   * replace an existing file under that name, it responds with a mark
   * using code 150:
   *
   * - "150 File status okay; about to open data connection"
   *
   * It then attempts to read the contents of the file from the data
   * connection, and closes the data connection. Finally it accepts the STOR
   * with:
   *
   * - "226 Closing data connection" if the entire file was successfully
   *    received and stored
   *
   * Or rejects the STOR with:
   *
   * - "425 Can't open data connection" if no TCP connection was established
   * - "426 Connection closed; transfer aborted" if the TCP connection was
   *    established but then broken by the client or by network failure
   * - "451 Requested action aborted: local error in processing",
   *   "452 - Requested action not taken", or "552 Requested file action
   *   aborted" if the server had trouble saving the file to disk.
   *
   * The server may reject the STOR request with:
   *
   * - "450 Requested file action not taken", "452 - Requested action not
   *   taken" or "553 Requested action not taken" without first responding
   *   with a mark. 
   */

  /* In active mode, we need to accept a connection on the data socket
   * (in passive mode, we have already connected the data channel to
   * the FTP server).
   */

  if (!FTPC_IS_PASSIVE(session))
    {
      ret = ftpc_sockaccept(&session->data);
      if (ret != OK)
        {
          ndbg("Data connection not accepted\n");
          return ERROR;
        }
    }

  /* Then perform the data transfer */

  if (xfrmode == FTPC_XFRMODE_ASCII)
    {
      ret = ftpc_sendtext(session, stream, session->data.outstream);
    }
  else
    {
      ret = ftpc_sendbinary(session, stream, session->data.outstream);
    }

  ftpc_sockflush(&session->data);
  ftpc_sockclose(&session->data);

  if (ret == 0)
    {
      fptc_getreply(session);
    }

  return OK;
}
static int ftpc_recvinit(struct ftpc_session_s *session, FAR const char *path,
                         uint8_t xfrmode, off_t offset)
{
  int ret;

  /* Reset transfer related variables */

  ftpc_xfrreset(session);

  ret = ftpc_xfrinit(session);
  if (ret != OK)
    {
      return ERROR;
    }

  /* Configure the transfer:  Initial file offset and tranfer mode */

  session->offset = 0;
  ftpc_xfrmode(session, xfrmode);

  /* Handle the resume offset (caller is responsible for fseeking in the
   * file)
   */

  if (offset > 0)
    {
      /* Send the REST command.  This command sets the offset where the
       * transfer should start.  This must come after PORT or PASV commands.
       */

      ret = ftpc_cmd(session, "REST %ld", offset);
      if (ret < 0)
        {
          ndbg("REST command failed: %d\n", errno);
          return ERROR;
        }

      session->size = offset;
    }

  /* Send the RETR (Retrieve a remote file) command.  Normally the server
   * responds with a mark using code 150:
   *
   * - "150 File status okay; about to open data connection"
   *
   * It then stops accepting new connections, attempts to send the contents
   * of the file over the data connection, and closes the data connection.
   * Finally it either accepts the RETR request with:
   *
   * - "226 Closing data connection" if the entire file was successfully
   *    written to the server's TCP buffers
   *
   * Or rejects the RETR request with:
   *
   * - "425 Can't open data connection" if no TCP connection was established
   * - "426 Connection closed; transfer aborted" if the TCP connection was
   *    established but then broken by the client or by network failure
   * - "451 Requested action aborted: local error in processing" or
   *   "551 Requested action aborted: page type unknown" if the server had
   *   trouble reading the file from disk.
   */

  ret = ftpc_cmd(session, "RETR %s", path);
  if (ret < 0)
    {
      ndbg("RETR command failed: %d\n", errno);
      return ERROR;
    }

  /* In active mode, we need to accept a connection on the data socket
   * (in passive mode, we have already connected the data channel to
   * the FTP server).
   */

  if (!FTPC_IS_PASSIVE(session))
    {
      ret = ftpc_sockaccept(&session->data);
      if (ret != OK)
        {
          ndbg("Data connection not accepted\n");
        }
    }

  return ret;
}